Sea level; Dissolved oxygen parameters in the water column; Vertical velocity of the water column (currents); Salinity of the water column; Horizontal velocity of the water column (currents); Temperature of the water column; Concentration of suspended particulate material in the water column

Hydrographic and bacterial tracing survey, River Swale, Kent, England 1990: hydrographic and bacteriological tracing survey of the Swale estuary, to collect a continuous 31 day record of water levels at three designated sites; to determine tidal velocities and water quality over a complete spring and neap tide at four designated sites; to determine the degree of retention within the estuary of simulated discharges using bacteria and bacteriophage.